Electric furnace



F. w. MONAT.' ELECTRlG-FURNACE.

APPLXCATION FILED MAR. 9*, 1921;

Patened Apr. 2*, 1922.

HtETS-SHEET l.

Mullin yNIH! Hummm' F. w. MOFFA. ELECTHH) FURNACE.

V APPLICATION FILED MAR. 9, 1921.

Patente. Apr. 25, 1922.

' 2 sums-SHEET 2.

ililluw lINV'ezNTcIa.

lJ-mf'ra su'rrs raremortica.

` aannemer w. narrante Waseca, @Numerimat y y of York. Province of Toma w/Lom it may concern.-

Be it known 'that I, FREDERICK Mor- FAT, of the town of l/Vest'on, in the county Ontario, Canada, a subject of the K invented certain new and usefulV Improvements in Electric Furnaces,

. following 1s a specification.

porting bar; and

This invention and an entire absence of dust and deleterious gases are essentlal, and In objectisto devise a simply constructed, and.

eii'ective furnace of this type vvhlch is not I attain my object by meansiofl-the constructions hereinafter described and illus- -trated in the accompanying drawings in b Which Fig. l is-a cross section'o my improved' furnace; y

F ig. -2 a longitudinal vertical he'same, partly broken away;v

' ig. 3. a-longitudinal horizontalsection of the same, partly broken away;

jFig. 4 a side election of 'an element supsectionn of 1g. 5 an end elevation, partly in section,

. of the same.

In the drawings like numerals of reference indicate corresponding parts in the different figures.

On the inner face 2 of one or more Walls vof the furnace 1, are carried supporting bars 3 of insulating material through which the resistance the inner walll from at, the bar 3v is provided with one or more flanges 5 extending laterally thereof. I- e bars 3 are arranged side by side and ofeach bar is formed one of the flanges 5 havin its outer edge adjacent the outer edge of 51e flange on the adjacent bar. The bar 3 is provided Witha flanged head 6.

prefer tocarry the supporting bars 3 n t e he Wall or walls are formed of or provided supporting members 7 arranged Side by sidel 1n any suitable manner. These supporting members are I-shaped in cross secl tion, the inner flanges 8 being narrower than ing of GreatJBritain, have of which the' inglnembers 7.

y porting members 7, r It will wirlng 4 is strung. To substan-l tlallly completely shield the e ELECTRIC FURNAE.

=Speciiication of Letters latent. Patente App. 251922 -ip'piieaaoii'nieam'rcn 9; 192'1. serial No. 450,850.

. the outer flanges 9 sol that slots "10 are formed betweenthe in ner Hanges of two adjacent i members. 'When the supporting members yheating eiement the outer iianges 9 of the laid on the bottom ofthe furnace. r.The bars 3 are adapted to be received inthe slots 10 and the 'iianges 5 rest on the supporting members 7. The anged head 6 is spaced from the flanges 5 to allow clearance for the Ainner anges S on the support- It is evident that with this arrangement the bars 3 are held from vertical displacement.

It will be noted that the ianges 5 extend substantially to the center ot each bars supreadilyv be seen that the supporting members 7, which are made-, of `refractory material, are shielded fromthe radiant heat of the resistance wir- Lhe danges on the. porcelain The heating element, as' shown, is Wired to give three heats, which necessitates the use of two separate yresistancee having :tour free ends l1. These ends are integral with the resistance wiring and are the Wall of the furnace to the outside thereof for connection with the circuit or circuits from which electrlc energy is supplied.

4 exterior o'fthe furnace l is provided with protective the furnace and recesses formed in its inner side to receive the outer ends ci'the bushings 13. The terminals for'the ends ll and the-electric circuit block. The resistance wiring is coiled intermediate its ends, and each of the bars 3 is provided with a transverse bearing i5 in aroused to @apport the lower` led through are mounted in lthis which the coils are supported. Each o vthese bcarings'is formed with a plurality ofl spaced shoulders 16 extending longitudinallyof the axis of the coils to permit free radiation. i o support "he resistance Wire as much sistance coils sagging and breaking when highly heated, the shoulders 16 are extended laterally on each side of the bars 3 to provide a4 suitable bearing of sufficient length to properly support the resistance coils.

as possible and thus prevent the re- 

